/mandos/release : revision 237.7.215

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect(),

59

getnameinfo() */

60

#include <fcntl.h> /* open(), unlinkat() */

60

#include <fcntl.h> /* open() */

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

62

*/

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

73

*/

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

75

getuid(), getgid(), seteuid(),

76

setgid(), pause(), _exit(),

77

unlinkat() */

76

setgid(), pause(), _exit() */

78

77

#include <arpa/inet.h> /* inet_pton(), htons() */

79

78

#include <iso646.h> /* not, or, and */

80

79

#include <argp.h> /* struct argp_option, error_t, struct

142

141

static const char sys_class_net[] = "/sys/class/net";

143

142

char *connect_to = NULL;

144

143

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

144

uid_t uid = 65534;

147

145

gid_t gid = 65534;

148

146

185

183

perror(print_text);

186

184

}

187

185

188

__attribute__((format (gnu_printf, 2, 3), nonnull))

186

__attribute__((format (gnu_printf, 2, 3)))

189

187

int fprintf_plus(FILE *stream, const char *format, ...){

190

188

va_list ap;

191

189

va_start (ap, format);

200

198

* bytes. "buffer_capacity" is how much is currently allocated,

201

199

* "buffer_length" is how much is already used.

202

200

*/

203

__attribute__((nonnull, warn_unused_result))

204

201

size_t incbuffer(char **buffer, size_t buffer_length,

205

202

size_t buffer_capacity){

206

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

219

216

}

220

217

221

218

/* Add server to set of servers to retry periodically */

222

__attribute__((nonnull, warn_unused_result))

223

219

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

224

220

int af, server **current_server){

225

221

int ret;

236

232

perror_plus("strdup");

237

233

return false;

238

234

}

239

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

235

/* Special case of first server */

245

236

if(*current_server == NULL){

246

237

new_server->next = new_server;

247

238

new_server->prev = new_server;

248

239

*current_server = new_server;

240

/* Place the new server last in the list */

249

241

} else {

250

/* Place the new server last in the list */

251

242

new_server->next = *current_server;

252

243

new_server->prev = (*current_server)->prev;

253

244

new_server->prev->next = new_server;

254

245

(*current_server)->prev = new_server;

255

246

}

247

ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);

248

if(ret == -1){

249

perror_plus("clock_gettime");

250

return false;

251

}

256

252

return true;

257

253

}

258

254

259

255

/*

260

256

* Initialize GPGME.

261

257

*/

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

258

static bool init_gpgme(const char *seckey, const char *pubkey,

259

const char *tempdir, mandos_context *mc){

267

260

gpgme_error_t rc;

268

261

gpgme_engine_info_t engine_info;

269

262

270

263

/*

271

264

* Helper function to insert pub and seckey to the engine keyring.

272

265

*/

273

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

274

267

int ret;

275

268

int fd;

276

269

gpgme_data_t pgp_data;

357

350

* Decrypt OpenPGP data.

358

351

* Returns -1 on error

359

352

*/

360

__attribute__((nonnull, warn_unused_result))

361

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

354

size_t crypto_size,

363

355

char **plaintext,

483

475

return plaintext_length;

484

476

}

485

477

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

488

479

const char *ret = gnutls_strerror(value);

489

480

if(ret == NULL)

490

481

ret = "(unknown)";

492

483

}

493

484

494

485

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

486

static void debuggnutls(__attribute__((unused)) int level,

497

487

const char* string){

498

488

fprintf_plus(stderr, "GnuTLS: %s", string);

499

489

}

500

490

501

__attribute__((nonnull, warn_unused_result))

502

491

static int init_gnutls_global(const char *pubkeyfilename,

503

492

const char *seckeyfilename,

504

493

mandos_context *mc){

578

567

return -1;

579

568

}

580

569

581

__attribute__((nonnull, warn_unused_result))

582

570

static int init_gnutls_session(gnutls_session_t *session,

583

571

mandos_context *mc){

584

572

int ret;

641

629

__attribute__((unused)) const char *txt){}

642

630

643

631

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

632

static int start_mandos_communication(const char *ip, in_port_t port,

646

633

AvahiIfIndex if_index,

647

634

int af, mandos_context *mc){

648

635

int ret, tcp_sd = -1;

649

636

ssize_t sret;

650

struct sockaddr_storage to;

637

union {

638

struct sockaddr_in in;

639

struct sockaddr_in6 in6;

640

} to;

651

641

char *buffer = NULL;

652

642

char *decrypted_buffer = NULL;

653

643

size_t buffer_length = 0;

734

724

735

725

memset(&to, 0, sizeof(to));

736

726

if(af == AF_INET6){

737

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

738

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

727

to.in6.sin6_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &to.in6.sin6_addr);

739

729

} else { /* IPv4 */

740

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

741

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

730

to.in.sin_family = (sa_family_t)af;

731

ret = inet_pton(af, ip, &to.in.sin_addr);

742

732

}

743

733

if(ret < 0 ){

744

734

int e = errno;

753

743

goto mandos_end;

754

744

}

755

745

if(af == AF_INET6){

756

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

757

if(IN6_IS_ADDR_LINKLOCAL

758

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

759

756

if(if_index == AVAHI_IF_UNSPEC){

760

757

fprintf_plus(stderr, "An IPv6 link-local address is"

761

758

" incomplete without a network interface\n");

763

760

goto mandos_end;

764

761

}

765

762

/* Set the network interface number as scope */

766

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

763

to.in6.sin6_scope_id = (uint32_t)if_index;

767

764

}

768

765

} else {

769

((struct sockaddr_in *)&to)->sin_port = htons(port);

766

to.in.sin_port = htons(port);

770

767

}

771

768

772

769

if(quit_now){

790

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

792

789

if(af == AF_INET6){

793

ret = getnameinfo((struct sockaddr *)&to,

794

sizeof(struct sockaddr_in6),

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

795

791

addrstr, sizeof(addrstr), NULL, 0,

796

792

NI_NUMERICHOST);

797

793

} else {

798

ret = getnameinfo((struct sockaddr *)&to,

799

sizeof(struct sockaddr_in),

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

800

795

addrstr, sizeof(addrstr), NULL, 0,

801

796

NI_NUMERICHOST);

802

797

}

815

810

}

816

811

817

812

if(af == AF_INET6){

818

ret = connect(tcp_sd, (struct sockaddr *)&to,

819

sizeof(struct sockaddr_in6));

813

ret = connect(tcp_sd, &to.in6, sizeof(to));

820

814

} else {

821

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

822

sizeof(struct sockaddr_in));

815

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

823

816

}

824

817

if(ret < 0){

825

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

818

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

826

819

int e = errno;

827

820

perror_plus("connect");

828

821

errno = e;

1043

1036

return retval;

1044

1037

}

1045

1038

1046

__attribute__((nonnull))

1047

1039

static void resolve_callback(AvahiSServiceResolver *r,

1048

1040

AvahiIfIndex interface,

1049

1041

AvahiProtocol proto,

1057

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1051

flags,

1060

void *mc){

1052

void* mc){

1061

1053

if(r == NULL){

1062

1054

return;

1063

1055

}

1116

1108

const char *domain,

1117

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1110

flags,

1119

void *mc){

1111

void* mc){

1120

1112

if(b == NULL){

1121

1113

return;

1122

1114

}

1182

1174

errno = old_errno;

1183

1175

}

1184

1176

1185

__attribute__((nonnull, warn_unused_result))

1186

1177

bool get_flags(const char *ifname, struct ifreq *ifr){

1187

1178

int ret;

1188

1179

error_t ret_errno;

1207

1198

return true;

1208

1199

}

1209

1200

1210

__attribute__((nonnull, warn_unused_result))

1211

1201

bool good_flags(const char *ifname, const struct ifreq *ifr){

1212

1202

1213

1203

/* Reject the loopback device */

1255

1245

* corresponds to an acceptable network device.

1256

1246

* (This function is passed to scandir(3) as a filter function.)

1257

1247

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1248

int good_interface(const struct dirent *if_entry){

1260

1249

if(if_entry->d_name[0] == '.'){

1261

1250

return 0;

1279

1268

/*

1280

1269

* This function determines if a network interface is up.

1281

1270

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

1271

bool interface_is_up(const char *interface){

1284

1272

struct ifreq ifr;

1285

1273

if(not get_flags(interface, &ifr)){

1296

1284

/*

1297

1285

* This function determines if a network interface is running

1298

1286

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

1287

bool interface_is_running(const char *interface){

1301

1288

struct ifreq ifr;

1302

1289

if(not get_flags(interface, &ifr)){

1310

1297

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1311

1298

}

1312

1299

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

1300

int notdotentries(const struct dirent *direntry){

1315

1301

/* Skip "." and ".." */

1316

1302

if(direntry->d_name[0] == '.'

1323

1309

}

1324

1310

1325

1311

/* Is this directory entry a runnable program? */

1326

__attribute__((nonnull, warn_unused_result))

1327

1312

int runnable_hook(const struct dirent *direntry){

1328

1313

int ret;

1329

1314

size_t sret;

1337

1322

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1338

1323

"abcdefghijklmnopqrstuvwxyz"

1339

1324

"0123456789"

1340

"_.-");

1325

"_-");

1341

1326

if((direntry->d_name)[sret] != '\0'){

1342

1327

/* Contains non-allowed characters */

1343

1328

if(debug){

1347

1332

return 0;

1348

1333

}

1349

1334

1350

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1335

char *fullname = NULL;

1336

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1351

1343

if(ret == -1){

1352

1344

if(debug){

1353

1345

perror_plus("Could not stat hook");

1377

1369

return 1;

1378

1370

}

1379

1371

1380

__attribute__((nonnull, warn_unused_result))

1381

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

1373

mandos_context *mc){

1383

1374

int ret;

1387

1378

1388

1379

while(true){

1389

1380

if(mc->current_server == NULL){

1390

if(debug){

1381

if (debug){

1391

1382

fprintf_plus(stderr, "Wait until first server is found."

1392

1383

" No timeout!\n");

1393

1384

}

1394

1385

ret = avahi_simple_poll_iterate(s, -1);

1395

1386

} else {

1396

if(debug){

1387

if (debug){

1397

1388

fprintf_plus(stderr, "Check current_server if we should run"

1398

1389

" it, or wait\n");

1399

1390

}

1416

1407

- ((intmax_t)waited_time.tv_sec * 1000))

1417

1408

- ((intmax_t)waited_time.tv_nsec / 1000000));

1418

1409

1419

if(debug){

1410

if (debug){

1420

1411

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1421

1412

block_time);

1422

1413

}

1444

1435

ret = avahi_simple_poll_iterate(s, (int)block_time);

1445

1436

}

1446

1437

if(ret != 0){

1447

if(ret > 0 or errno != EINTR){

1438

if (ret > 0 or errno != EINTR){

1448

1439

return (ret != 1) ? ret : 0;

1449

1440

}

1450

1441

}

1452

1443

}

1453

1444

1454

1445

/* Set effective uid to 0, return errno */

1455

__attribute__((warn_unused_result))

1456

1446

error_t raise_privileges(void){

1457

1447

error_t old_errno = errno;

1458

1448

error_t ret_errno = 0;

1465

1455

}

1466

1456

1467

1457

/* Set effective and real user ID to 0. Return errno. */

1468

__attribute__((warn_unused_result))

1469

1458

error_t raise_privileges_permanently(void){

1470

1459

error_t old_errno = errno;

1471

1460

error_t ret_errno = raise_privileges();

1482

1471

}

1483

1472

1484

1473

/* Set effective user ID to unprivileged saved user ID */

1485

__attribute__((warn_unused_result))

1486

1474

error_t lower_privileges(void){

1487

1475

error_t old_errno = errno;

1488

1476

error_t ret_errno = 0;

1495

1483

}

1496

1484

1497

1485

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

1486

error_t lower_privileges_permanently(void){

1500

1487

error_t old_errno = errno;

1501

1488

error_t ret_errno = 0;

1507

1494

return ret_errno;

1508

1495

}

1509

1496

1510

__attribute__((nonnull))

1511

void run_network_hooks(const char *mode, const char *interface,

1497

bool run_network_hooks(const char *mode, const char *interface,

1512

1498

const float delay){

1513

struct dirent **direntries = NULL;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1531

runnable_hook, alphasort);

1532

#else /* not __GLIBC_PREREQ(2, 15) */

1533

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1534

alphasort);

1535

#endif /* not __GLIBC_PREREQ(2, 15) */

1536

#else /* not __GLIBC__ */

1537

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1499

struct dirent **direntries;

1500

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1501

alphasort);

1540

1502

if(numhooks == -1){

1541

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

int devnull = open("/dev/null", O_RDONLY);

1547

for(int i = 0; i < numhooks; i++){

1548

direntry = direntries[i];

1549

if(debug){

1550

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1551

direntry->d_name);

1503

if(errno == ENOENT){

1504

if(debug){

1505

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1552

1510

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

perror_plus("dup2(devnull, STDIN_FILENO)");

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1588

_exit(EX_OSERR);

1589

}

1590

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

ret = setenv("DEVICE", interface, 1);

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

ret = setenv("MODE", mode, 1);

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

ret = asprintf(&delaystring, "%f", (double)delay);

1612

if(ret == -1){

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

int devnull = open("/dev/null", O_RDONLY);

1515

for(int i = 0; i < numhooks; i++){

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1519

if(ret < 0){

1613

1520

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

ret = setenv("DELAY", delaystring, 1);

1617

if(ret == -1){

1521

continue;

1522

}

1523

if(debug){

1524

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

ret = setenv("DEVICE", interface, 1);

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

ret = setenv("MODE", mode, 1);

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

ret = asprintf(&delaystring, "%f", delay);

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

ret = setenv("DELAY", delaystring, 1);

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1618

1579

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

ret = setenv("CONNECT", connect_to, 1);

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1653

" with status %d\n", direntry->d_name,

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1659

" signal %d\n", direntry->d_name,

1660

WTERMSIG(status));

1661

continue;

1580

if(connect_to != NULL){

1581

ret = setenv("CONNECT", connect_to, 1);

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1662

1591

} else {

1663

fprintf_plus(stderr, "Warning: network hook \"%s\""

1664

" crashed\n", direntry->d_name);

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1592

int status;

1593

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1601

" with status %d\n", direntry->d_name,

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1608

" signal %d\n", direntry->d_name,

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

fprintf_plus(stderr, "Warning: network hook \"%s\""

1614

" crashed\n", direntry->d_name);

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1680

1628

}

1681

1629

1682

__attribute__((nonnull, warn_unused_result))

1683

1630

error_t bring_up_interface(const char *const interface,

1684

1631

const float delay){

1632

int sd = -1;

1685

1633

error_t old_errno = errno;

1686

int ret;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1687

1636

struct ifreq network;

1688

1637

unsigned int if_index = if_nametoindex(interface);

1689

1638

if(if_index == 0){

1698

1647

}

1699

1648

1700

1649

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

if(not get_flags(interface, &network)){

1650

if(not get_flags(interface, &network) and debug){

1703

1651

ret_errno = errno;

1704

1652

fprintf_plus(stderr, "Failed to get flags for interface "

1705

1653

"\"%s\"\n", interface);

1706

errno = old_errno;

1707

1654

return ret_errno;

1708

1655

}

1709

network.ifr_flags |= IFF_UP; /* set flag */

1656

network.ifr_flags |= IFF_UP;

1710

1657

1711

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1712

if(sd == -1){

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1713

1660

ret_errno = errno;

1714

1661

perror_plus("socket");

1715

1662

errno = old_errno;

1716

1663

return ret_errno;

1717

1664

}

1718

1665

1719

1666

if(quit_now){

1720

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1667

close(sd);

1724

1668

errno = old_errno;

1725

1669

return EINTR;

1726

1670

}

1730

1674

interface);

1731

1675

}

1732

1676

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

perror_plus("Failed to raise privileges");

1737

}

1677

/* Raise priviliges */

1678

raise_privileges();

1738

1679

1739

1680

#ifdef __linux__

1740

int ret_linux;

1741

bool restore_loglevel = false;

1742

if(ret_errno == 0){

1743

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1744

messages about the network interface to mess up the prompt */

1745

ret_linux = klogctl(8, NULL, 5);

1746

if(ret_linux == -1){

1747

perror_plus("klogctl");

1748

} else {

1749

restore_loglevel = true;

1750

}

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

messages about the network interface to mess up the prompt */

1683

int ret_linux = klogctl(8, NULL, 5);

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1751

1688

}

1752

1689

#endif /* __linux__ */

1753

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1754

ioctl_errno = errno;

1690

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1691

ret_errno = errno;

1755

1692

#ifdef __linux__

1756

1693

if(restore_loglevel){

1757

1694

ret_linux = klogctl(7, NULL, 0);

1761

1698

}

1762

1699

#endif /* __linux__ */

1763

1700

1764

/* If raise_privileges() succeeded above */

1765

if(ret_errno == 0){

1766

/* Lower privileges */

1767

ret_errno = lower_privileges();

1768

if(ret_errno != 0){

1769

errno = ret_errno;

1770

perror_plus("Failed to lower privileges");

1771

}

1772

}

1701

/* Lower privileges */

1702

lower_privileges();

1773

1703

1774

1704

/* Close the socket */

1775

1705

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1778

1708

}

1779

1709

1780

1710

if(ret_setflags == -1){

1781

errno = ioctl_errno;

1711

errno = ret_errno;

1782

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1783

1713

errno = old_errno;

1784

return ioctl_errno;

1714

return ret_errno;

1785

1715

}

1786

1716

} else if(debug){

1787

1717

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1805

1735

return 0;

1806

1736

}

1807

1737

1808

__attribute__((nonnull, warn_unused_result))

1809

1738

error_t take_down_interface(const char *const interface){

1810

1739

error_t old_errno = errno;

1811

1740

struct ifreq network;

1816

1745

return ENXIO;

1817

1746

}

1818

1747

if(interface_is_up(interface)){

1819

error_t ret_errno = 0, ioctl_errno = 0;

1748

error_t ret_errno = 0;

1820

1749

if(not get_flags(interface, &network) and debug){

1821

1750

ret_errno = errno;

1822

1751

fprintf_plus(stderr, "Failed to get flags for interface "

1823

1752

"\"%s\"\n", interface);

1824

errno = old_errno;

1825

1753

return ret_errno;

1826

1754

}

1827

1755

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1828

1756

1829

1757

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1830

if(sd == -1){

1758

if(sd < 0){

1831

1759

ret_errno = errno;

1832

1760

perror_plus("socket");

1833

1761

errno = old_errno;

1839

1767

interface);

1840

1768

}

1841

1769

1842

/* Raise privileges */

1843

ret_errno = raise_privileges();

1844

if(ret_errno != 0){

1845

perror_plus("Failed to raise privileges");

1846

}

1770

/* Raise priviliges */

1771

raise_privileges();

1847

1772

1848

1773

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1849

ioctl_errno = errno;

1774

ret_errno = errno;

1850

1775

1851

/* If raise_privileges() succeeded above */

1852

if(ret_errno == 0){

1853

/* Lower privileges */

1854

ret_errno = lower_privileges();

1855

if(ret_errno != 0){

1856

errno = ret_errno;

1857

perror_plus("Failed to lower privileges");

1858

}

1859

}

1776

/* Lower privileges */

1777

lower_privileges();

1860

1778

1861

1779

/* Close the socket */

1862

1780

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

1865

1783

}

1866

1784

1867

1785

if(ret_setflags == -1){

1868

errno = ioctl_errno;

1786

errno = ret_errno;

1869

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1870

1788

errno = old_errno;

1871

return ioctl_errno;

1789

return ret_errno;

1872

1790

}

1873

1791

} else if(debug){

1874

1792

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1882

1800

int main(int argc, char *argv[]){

1883

1801

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1884

1802

.priority = "SECURE256:!CTYPE-X.509:"

1885

"+CTYPE-OPENPGP", .current_server = NULL,

1803

"+CTYPE-OPENPGP", .current_server = NULL,

1886

1804

.interfaces = NULL, .interfaces_size = 0 };

1887

1805

AvahiSServiceBrowser *sb = NULL;

1888

1806

error_t ret_errno;

1892

1810

int exitcode = EXIT_SUCCESS;

1893

1811

char *interfaces_to_take_down = NULL;

1894

1812

size_t interfaces_to_take_down_size = 0;

1895

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1896

char old_tempdir[] = "/tmp/mandosXXXXXX";

1897

char *tempdir = NULL;

1813

char tempdir[] = "/tmp/mandosXXXXXX";

1814

bool tempdir_created = false;

1898

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1899

1816

const char *seckey = PATHDIR "/" SECKEY;

1900

1817

const char *pubkey = PATHDIR "/" PUBKEY;

2082

1999

/* Work around Debian bug #633582:

2083

2000

<http://bugs.debian.org/633582> */

2084

2001

2085

/* Re-raise privileges */

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2089

perror_plus("Failed to raise privileges");

2090

} else {

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2091

2004

struct stat st;

2092

2005

2093

2006

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2133

2046

}

2134

2047

2135

2048

/* Lower privileges */

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2139

perror_plus("Failed to lower privileges");

2140

}

2049

lower_privileges();

2141

2050

}

2142

2051

}

2143

2052

2169

2078

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2170

2079

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2171

2080

}

2172

run_network_hooks("start", interfaces_hooks != NULL ?

2173

interfaces_hooks : "", delay);

2081

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2174

2085

}

2175

2086

2176

2087

if(not debug){

2254

2165

2255

2166

/* If no interfaces were specified, make a list */

2256

2167

if(mc.interfaces == NULL){

2257

struct dirent **direntries = NULL;

2168

struct dirent **direntries;

2258

2169

/* Look for any good interfaces */

2259

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2260

2171

alphasort);

2275

2186

}

2276

2187

free(direntries);

2277

2188

} else {

2278

if(ret == 0){

2279

free(direntries);

2280

}

2189

free(direntries);

2281

2190

fprintf_plus(stderr, "Could not find a network interface\n");

2282

2191

exitcode = EXIT_FAILURE;

2283

2192

goto end;

2306

2215

break;

2307

2216

}

2308

2217

bool interface_was_up = interface_is_up(interface);

2309

errno = bring_up_interface(interface, delay);

2218

ret = bring_up_interface(interface, delay);

2310

2219

if(not interface_was_up){

2311

if(errno != 0){

2220

if(ret != 0){

2221

errno = ret;

2312

2222

perror_plus("Failed to bring up interface");

2313

2223

} else {

2314

errno = argz_add(&interfaces_to_take_down,

2315

&interfaces_to_take_down_size,

2316

interface);

2317

if(errno != 0){

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2318

2229

perror_plus("argz_add");

2319

2230

}

2320

2231

}

2351

2262

goto end;

2352

2263

}

2353

2264

2354

/* Try /run/tmp before /tmp */

2355

tempdir = mkdtemp(run_tempdir);

2356

if(tempdir == NULL and errno == ENOENT){

2357

if(debug){

2358

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2359

run_tempdir, old_tempdir);

2360

}

2361

tempdir = mkdtemp(old_tempdir);

2362

}

2363

if(tempdir == NULL){

2265

if(mkdtemp(tempdir) == NULL){

2364

2266

perror_plus("mkdtemp");

2365

2267

goto end;

2366

2268

}

2269

tempdir_created = true;

2367

2270

2368

2271

if(quit_now){

2369

2272

goto end;

2444

2347

sleep((unsigned int)retry_interval);

2445

2348

}

2446

2349

2447

if(not quit_now){

2350

if (not quit_now){

2448

2351

exitcode = EXIT_SUCCESS;

2449

2352

}

2450

2353

2505

2408

if(debug){

2506

2409

fprintf_plus(stderr, "Starting Avahi loop search\n");

2507

2410

}

2508

2411

2509

2412

ret = avahi_loop_with_timeout(simple_poll,

2510

2413

(int)(retry_interval * 1000), &mc);

2511

2414

if(debug){

2552

2455

}

2553

2456

}

2554

2457

2555

/* Re-raise privileges */

2458

/* Re-raise priviliges */

2556

2459

{

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

/* Take down the network interfaces which were brought up */

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

if(debug and (interfaces_to_take_down == NULL)){

2579

fprintf_plus(stderr, "No interfaces needed to be taken"

2580

" down\n");

2581

}

2582

}

2583

}

2584

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

perror_plus("Failed to lower privileges permanently");

2588

}

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

/* Take down the network interfaces which were brought up */

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2476

}

2477

}

2478

if(debug and (interfaces_to_take_down == NULL)){

2479

fprintf_plus(stderr, "No interfaces needed to be taken"

2480

" down\n");

2481

}

2482

}

2483

2484

lower_privileges_permanently();

2589

2485

}

2590

2486

2591

2487

free(interfaces_to_take_down);

2592

2488

free(interfaces_hooks);

2593

2489

2594

2490

/* Removes the GPGME temp directory and all files inside */

2595

if(tempdir != NULL){

2491

if(tempdir_created){

2596

2492

struct dirent **direntries = NULL;

2597

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

int numentries = scandirat(tempdir_fd, ".", &direntries,

2605

notdotentries, alphasort);

2606

#else /* not __GLIBC_PREREQ(2, 15) */

2607

int numentries = scandir(tempdir, &direntries, notdotentries,

2608

alphasort);

2609

#endif /* not __GLIBC_PREREQ(2, 15) */

2610

#else /* not __GLIBC__ */

2611

int numentries = scandir(tempdir, &direntries, notdotentries,

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

for(int i = 0; i < numentries; i++){

2616

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2617

if(ret == -1){

2618

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2619

" \"%s\", 0): %s\n", tempdir,

2620

direntries[i]->d_name, strerror(errno));

2621

}

2622

}

2623

2624

/* need to clean even if 0 because man page doesn't specify */

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

if(ret == -1 and errno != ENOENT){

2631

perror_plus("rmdir");

2632

}

2493

struct dirent *direntry = NULL;

2494

int numentries = scandir(tempdir, &direntries, notdotentries,

2495

alphasort);

2496

if (numentries > 0){

2497

for(int i = 0; i < numentries; i++){

2498

direntry = direntries[i];

2499

char *fullname = NULL;

2500

ret = asprintf(&fullname, "%s/%s", tempdir,

2501

direntry->d_name);

2502

if(ret < 0){

2503

perror_plus("asprintf");

2504

continue;

2505

}

2506

ret = remove(fullname);

2507

if(ret == -1){

2508

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2509

strerror(errno));

2510

}

2511

free(fullname);

2633

2512

}

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

2513

}

2514

2515

/* need to clean even if 0 because man page doesn't specify */

2516

free(direntries);

2517

if (numentries == -1){

2518

perror_plus("scandir");

2519

}

2520

ret = rmdir(tempdir);

2521

if(ret == -1 and errno != ENOENT){

2522

perror_plus("rmdir");

2635

2523

}

2636

2524

}

2637

2525